I like to use this. In tight spots I've used the center guide without the plastic housing.
http://www.averytools.com/prodinfo.asp?number=25783
There is always some way to make a jig.
http://www.kitplanes.com/issues/30_11/shop_tips/drill_blocks_20873-1.html
Sadly, it is "subscriber only" content...but you can cure that
What Bob said works, provided the aluminum is not bent or curved.
Greg
Dan,
I am not a subscriber to Kitplanes. I have so many subscriptions (professional and recreational) that I am slowly letting go of some. Please tell/motivate/educate me what Kitplanes bring to the table that makes it worthwhile.
Appreciated. Johan